Pipe coupling



c. E. SMITH Re. 18,119

PIPE COUPLING Original Filed March 25, 192'? Ill iii? INVENTOR. 6/20/1125 5 5777/? A TTQRNEY.

' Reissued July .7, 1931 PATENT OFFICE CHARLES E. SMITH,

OI THREE RIVERS, TEXAS, ASSIGNOR TO HINDERLITER TOOL COMPANY, A. CORPORATION OF OKLAHOMA PIPE COUPLING Original 110. 1,682,635, dated August 28,1928, Serial No. 178,385, fl1ed March 25,.19Q7. Application for reissue filed June 9,. 1930. Serial No. 460,070.

My invention relates to pipe couplings and more articularly to a device of that character or connecting sections of pipe or tub- .ing through which fluid is conducted, the

principal objectof the invention being to effectively seal the connection between the coupling and ipe sections for preventing leakage of flui at the coupling.

In accomplishing this ob ect have provide d improved details of structure, the preferred forms of which are illustrated in the accompanying drawings, wherein Fig. 1 is an elevational view of one form of my improved coupling showing the couling sleeve "and one of the pi e sections and oint rings in central longitu inal sectlon. I

Fig. 2 is an elevational view of part of of the pipe sections partly broken away and in central longitudinal section, illustratin packing at the joint.

Referring morein etail to the drawings:

1 designates the coupling sleeve, having internal screw threads'2 at its opposite ends,

and an internal flange 3 between and spaced from the threaded portions 2 forming outwardly facing shoulders 4, the inner surface of the sleeve being referably'countersunk between the threade sectionsand shoulders to rovide annular ooves 5 for containin pac ing, as present y described.

geated on the shoulders 4 are rings 6 of rigid material, having ta ered outer peripheries 7, and preferably 0 a length to extend beyond the inner terminals of the threaded portions 2 at the ends ofthe sleeve 1, and of a diameter at their outer ends to be received within the ends of pipe or tube Sections 8 when the latter are threaded into the coupling' sleeve,- the diameter of the rings increasing ends in such degree that as the ends of-the pipe sections pro] ect beyondthe threaded portions of the sleeve they engage the tapered peripheries of the rings and areexpanded into the'grooves 5 to seat the threaded portions ofthe pipe sections tightly in the threaded ortions of the sleeve, and thereby effectively seal the jointbetwee'n thepipe sections andsleeve and lock the'pipe section the sleeve; I

from their. outer ends to their inner In order to further insure effective sealing of the joint I locate packing rings 9 of expansible material on the shoulders 4 between the rings '6 and the wall of the coupling sleeve so that when the pipe sections are threaded into the coupling sleeve the ends of the p pe sections engage the ends of the packmg'rmgs and compress the latter-between the sleeve and rings to efi'ectively seal the joint between-the pipe sections and sleeve. It is apparent that' with such arrangement the rin s 6, being ofrigid material, retain the pac 'ng rings against inward displacement so that end thrusts of the pipe sections against the rings compress the latter laterally andand a relatively rigid keeper ring seated on 4 the shoulder within the packing ring for restraining lateral expansion of the packing rlng responsive to end thrust of a pipe section, threaded into the connecting member and projected between the opposed walls of the keeper ring and connecting-member.

2. A pipe coupler having'its bore-threaded from thejends thereof and havingannular pockets at the terminals of the threads, and hollowfrusto conical expanders formed independent of the coupling and desi ned to be arranged therein and have their wi ened ends contact with the inner walls. of the pockets and to project into the threaded portion of the bore of the coupler and engage with pipes which are-screwed in the coupler.

3. A coupler for the threaded'ends of metal pipes, comprising a member having its bore threaded at the ends thereof, and having annular pockets-at theterminals of he threads 'der of eac tacted by the said expanders-to flare or expand the pipe and projectthe same into" the pockets. v p

4. A pipe coupler having its bore threaded from the ends thereof and having annular pockets at the terminals of said threads and ollow frusto conical expander-s each contacting with the inner walls of one pocket and projecting into the threaded portion of thebore. of the coupler, said threaded bore. desi ned to have screwed therein pipe members whose bores are contacted by the frusto conical expanders, and compressible rings on the expanders contacted by the pipe members de-.

signed to be forced thereby against the inner walls of the pockets and to be compressed intosaid pockets.

5. In a pipe coupling, a threaded connecting member having an interior annular recess, a packing unit within said recess including a compressible body, and a relatively rigid hning member abutting one wall of said recess inrestraining relation within said body. 7

6. In a pipe coupling, a threaded connecting member, an interior annular recess 1nsaid connecting member, a packing unit within said recess including a compressible body engageable by the end of the pipe section, and a relatively rigid lining abuttlng one wall of said recess in restraining relation with said body for effecting compression of said body between the lining and the wall of the connecting memberin response to thrust of the pipe section on said body.

7. In a pipe coupling, a connecting member having an interior annular shoulder, apacking ring within said connecting mem-' her and abutting said shoulder, a relatively rigid member having one end thereof abutting said shoulder and being tapered to form a wall opposed to the wall of the connecting member, and means to compress said ring between said walls and said shoulder.

v 8. In a pipe coupling, a connecting member having an interior annular shoulder, a sealing unit within said connecting member including a packing ring and a. relatively rigid member within the packing ring abutting said shoulder and having a wall opposed to the wall of the connecting member, one of said walls being tapered and means to compress said packing ring between said walls and said shoulder. 9. In a device of the character described, a member for cou'pli two sections of ipe,

said member havingt readed ends, and avereby a pipe screwed in-the -said member-having threaded'ends, and.

.' ing interior annular recessesfof ater diam:

eter than the base of the. threa s within said ends, a shoulder in said recess',-and means abuttingsaid shoulder for forcing the end of. a pipe outwardly into said recess to prevent unscrewing of the pipe. 1 v, I 10. In a device of the character described, a member for coupling two sections of ipe,

aving'interior annular recesses of greater diameter than the baseof the threadswithin said ends, a shoulder in said recess, and a" hollow cylindrical" member having an outside tapered face abutting said shoulderjfor forcing .the end of a pipe outwardly as the same is beingscrewed into said recess to prevent unscrewing of the pipe.

11. In a pipe coupling, a hollow member.

having internal screw threads extendinginwardly a distance from each end, an internal flange-intermediate the ends of said member, said member also having enlarged interior recesses formed on each side of said flange, and hollow cylidric'al-members having'-outside tapered faces positioned'in said casing and adapted to have their reduced ends enter pipes while-beingsecured in said member,

their opposite. ends adapted to abut the flange and flare the ends of the pipes outwardly in said recesses. I

12. In a pipe coupling, a. connectin member having an interiorannular 'shoul er at adistance from its ends,

restin on said seat, said .kee

straining lateral expansion of ring responsive .to end thrust of a pipe-section threaded into the connecting member, and

lproJecting betweenthe opposed walls of the eeper ring and connecting member.

13. In a pipe coupling, a connecting member internally threaded for a distance fromeach end, interior annular shoulders formed in said member intermediate its ends, a packing ring located on each shoulder, and a keeper ring extending into each of said acking rings whereby lateral expansion o said packing rings is prevented when end thrust is exerted thereon. I

In testimony whereof I aflix my signature.

CHARLES E. SMITH.

per ring rethe packing a relatively rigid keeper ring located in saidmember, a packing ring surrounding said keeper ring and 

